Portable terminal, information processing apparatus, content display system and content display method

ABSTRACT

A portable terminal includes a receiving unit which receives content information, an external device communication unit which conducts communication with an external information device, a display unit which displays the content information received by the receiving unit, an acquiring unit which acquires identification information identifying the content information displayed by the display unit, an operation unit which receives an operation indication from a user, and a control unit which conducts control such that if a transmission indication of the identification information is received by the operation unit while the content information is being displayed, the identification information acquired by the acquiring unit is transmitted to the external information device and the display of the content information by the display unit is terminated.

BACKGROUND OF THE INVENTION

The present invention relates to a portable terminal, an information processing apparatus, a content display system, and a content display method.

Cellular phones capable of browsing internet sites and television (TV) programs have come into wide use today. On the other hand, there have been increasingly employed television sets capable of connecting to networks. In this environment, a technique in which a content received by a cellular phone is viewed by a television set with higher usability and a technique in which a cellular phone is employed as a remote control device to operate a television set are under discussion.

For example, JP-A-2006-286855 describes a cellular phone including a broadcast receiving function. The cellular phone transmits a history of viewed programs and playback indication signals thereof to a video playback device. According to the cellular phone, a program which the user viewed outside his or her house can be again viewed on a large screen after returning home. It is also possible that when the user viewed part a program outside home during a free period of time, the user can view its subsequent part, parts before and after the viewed part, or the entire program from the start point to the end point thereof after returning home by using a recording and reproducing device in the house.

JP-A-2005-135346 describes a technique for use in a system including a cellular phone, an information processing apparatus, and a display. When mail data including Uniform Resource Locator (URL) information is received, the cellular phone transfers the mail data via radio communication to the information processing apparatus. On receiving the mail data, the information processing apparatus displays the mail data on the display. If an operation is conducted for the URL information in the mail data, an operation is conducted to access a radio communication network other than a network used for the radio communication on the basis of the URL information, and resultantly obtained information is displayed on the display.

JP-A-2006-338406 describes a technique in which a communication terminal device including another function is ordinary employed as a remote control device to remotely control other communication terminal devices.

Additionally, JP-A-2007-74265 describes a videoconference system using a cellular phone connected via the internet to a videoconference server to communicate information with the server and a display device capable of, when connected via a communication function to the cellular phone, displaying the information. The videoconference system controls devices connected thereto via the videoconference server and a network. The videoconference system includes an information display module to display on a first display of the cellular phone a first videophone screen on which the information is displayed using letters. The information display module also displays on a second display of the display device a second videophone screen on which image information included in the information communicated as above is displayed. JP-A-2007-74265 describes a system in which a monitor camera is remotely controlled by a cellular phone, and a video image produced from the camera is displayed on a display screen of a Personal Computer (PC).

SUMMARY OF THE INVENTION

The portable terminal described in JP-A-2006-286855 is configured to meet the desires such as a desire in which a program viewed by the user outside his or her house is to be again viewed on a large screen after returning home and a desire to view, for part of a program viewed by the user outside his or her house during a free period of time, its subsequent part, parts before and after the viewed part, or the entire program from the start point to the end point thereof after returning home by using a recording and reproducing device in the house (paragraph 0006). Specifically, the portable terminal is constructed such that a list of programs viewed in the past is displayed (FIG. 7) and a program selected therefrom is reproduced by the video playback device.

However, there exists a desire in which a content just being viewed by a portable terminal is to be passed to a video playback device to continuously viewed the content thereon. This corresponds to, for example, a situation as follows. In a room in which the video playback device is installed, the user is viewing a program on a portable terminal and desires to pass the viewing of the program to the video playback device.

In this case, according to the portable terminal described in JP-A-2006-286855, it is required that the user terminates the viewing on the portable terminal and then selects from the list of programs viewed in the past a program to be reproduced by the video playback device. This leads to an increase in the number of operation steps depending on cases.

According to the mail terminal described in JP-A-2005-135346, it is possible, by transmitting a URL, for the information processing apparatus or device to receive information indicating whether or not an internet site has been viewed by the cellular phone. However, in use of the mail terminal described in JP-A-2005-135346, if it is desired to view an internet site on the information processing device side, it is required that the user operates the information processing device. This leads to an increase in the number of operation steps in some cases.

In JP-A-2006-338406 and JP-A-2007-74265, description has not been given of the continuation of the viewing of a content on a communication terminal device in which the viewing of the content on the communication terminal is passed to a television set or the like. Therefore, in a situation wherein the viewing of a content just being conducted on the communication terminal device is to be continued on the video playback device, it is required, even if a cellular terminal is used as a remote control device, that the user terminates the viewing on the cellular terminal and then reproduces the video on the video playback device. This leads to an increase in the number of operation steps depending on cases.

That is, description has not been given of an idea to achieve a smoother cooperative operation when the viewing of a content just being conducted on the portable terminal is to be relayed or passed to the video playback device.

It is therefore an object of the present invention to provide a portable terminal, an information processing apparatus, a content display system, and a content display method wherein viewing of a content on a portable terminal is smoothly passed to an information processing apparatus.

To achieve the object according to the present invention, there is provided a portable terminal including a receiving unit which receives content information, an external device communication unit which conducts communication with an external information device, a display unit which displays the content information received by the receiving unit, an acquiring unit which acquires identification information identifying the content information displayed by the display unit, an operation unit which receives an operation indication from a user, and a control unit which conducts control such that if a transmission indication of the identification information is received by the operation unit while the content information is being displayed, the identification information acquired by the acquiring unit is transmitted to the external information device and the display of the content information by the display unit is terminated.

According to the present invention, there is also provided an information processing apparatus including an input unit which inputs content information, a communication unit which conducts communication with a portable terminal, a display unit which displays the content information inputted by the input unit, a control unit which conducts control such that if the communication unit receives identification information identifying second content information displayed on the portable terminal from the portable terminal while the display unit is displaying first content information, the input unit inputs the second content information corresponding to the identification information to be displayed on the display unit, and the display unit displays the second content information in place of the first content information, the control unit conducting control such that if the communication unit receives an indication signal indicating termination of the display of the second content information by the display unit, the display of the second content information is terminated and the display of the first content information is resumed.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, objects and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings wherein:

FIG. 1 is a schematic diagram showing an operation environment of an internet connection terminal and a mobile terminal in first and second embodiments;

FIG. 2 is a block diagram showing a configuration of a first embodiment of an internet connection terminal;

FIG. 3 is a block diagram showing a configuration of a first embodiment of a mobile terminal;

FIG. 4 is a diagram showing a transition example of screen display on an internet connection terminal and a mobile terminal in the first to third embodiments;

FIG. 5 is a flowchart for explaining operations of an internet connection terminal and a mobile terminal in the first embodiment;

FIG. 6 is a block diagram showing a configuration of a second embodiment of an internet connection terminal;

FIG. 7 is a block diagram showing a configuration of a second embodiment of a mobile terminal;

FIGS. 8A and 8B are a flowchart for explaining operations of an internet connection terminal and a mobile terminal in the second embodiment;

FIG. 9 is a table showing a data layout of an operation history in the third embodiment;

FIG. 10 is a table showing a data layout of an operation history in the third embodiment;

FIG. 11 is a table showing a data layout of transmitted data in the third embodiment; and

FIG. 12 is a flowchart for explaining operations of an internet connection terminal and a mobile terminal in the third embodiment.

DESCRIPTION OF THE EMBODIMENTS

While we have shown and described several embodiments in accordance with our invention, it should be understood that disclosed embodiments are susceptible of changes and modifications without departing from the scope of the invention. Therefore, we do not intend to be bound by the details shown and described herein but intend to cover all such changes and modifications a fall within the ambit of the appended claims.

First Embodiment

Description will now be given of an embodiment including as an example a mobile terminal 101 as a portable terminal, an internet connection terminal 100, and an internet site as a content.

In the embodiment, the internet connection terminal 100 and the mobile terminal 101 are terminals capable of connecting to the internet to display a homepage provided by an internet site. FIG. 1 shows an outline of associated facilities and connection environments for the terminals 100 and 101 to connect to the internet 104. Specifically, the terminal 100 connects to the internet 104 and the terminal 101 connects thereto using an input unit 102 and a base station 103. The mobile terminal 101 is a portable information processing terminal, for example, a cellular phone (abbreviated to “cellular”), a Personal Digital Assistant (PDA), or a smart phone.

The input unit 102 is an input device of the mobile terminal 101 and includes, for example, a plurality of buttons. The user conducts an operation for the mobile terminal 101 using a key, a button, and a dial of the input unit 102.

The base station 103 is a base station with which the mobile terminal 101 conducts radio communication to connect to the internet.

The internet 104 conceptually represents a set of Web servers and various services on the internet and is connected to the internet connection terminal 100 and the mobile terminal 101. The mobile terminal 101 connects via the base station 103 to the internet 104.

The internet connection terminal 100 is, for example, a television (TV) set, a SetTop Box (STB), or a home server for Digital Living Network Alliance (DLNA) and has a function to output video signals and a function to connect to the internet. The terminal 100 is capable of connecting to the internet to display a homepage. The terminal 100 also enables the user to view digital broadcast programs delivered using a ground wave, Broadcasting by Satellite (BS), Communication Satellite (CS), the internet, and the like. As FIG. 2 shows, the internet connection terminal 100 includes a digital broadcast receiving unit 200, a digital broadcast signal processing unit 201, a system control unit 202, an audio processing unit 203, a speaker 204, a video processing unit 205, a display unit 206, a network communication unit 207, an internet browser 208, a data saving unit 209, and a data transmitting and receiving unit 210.

The digital broadcast receiving unit 200 is a circuit which receives desired broadcast data via an antenna or a cable and restores, based on received signals, the broadcast data into data to be digitally processed by the digital broadcast signal processing unit 201.

The digital broadcast signal processing unit 201 includes, for example, a signal separator to conduct demultiplexing of a signal and a decoder to conduct decoding of a signal. The processing unit 201 receives digital broadcast data from the receiving unit 200, separates audio data and video data therefrom, converts the audio data into data of a data format to be processed by the audio processing unit 203 and converts the video data into data of a data format to be processed by the video processing unit 203, and outputs the converted data items to the audio and video processing units 203 and 205, respectively.

The system control unit 202 includes, for example, a microprocessor and controls operations of processing units required to reproduce digital broadcast and those required to access the internet.

The audio processing unit 203 includes, for example, an Analog-to-Digital (AD) converter. The processing unit 203 converts digital audio data from the digital broadcast signal processing unit 201 into analog audio data to output the data to the speaker 204.

The speaker 204 receives the analog audio data from the audio processing unit 203 to produce sounds from the data.

The video processing unit 205 includes, for example, processing devices such as an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), and a Micro Processing Unit (MPU). The unit 205 receives video data from the digital broadcast signal processing unit 201 and the internet browser 208, which will be described later, converts the data into data to be processed by the display unit 206, and delivers the data thereto.

The display unit 206 includes, for example, a display device such as a liquid-crystal display, a plasma display, or the like. The display unit 206 includes a display panel, a panel control circuit, and a panel control driver, and displays an image on the display panel using data supplied from the video processing unit 205. If the internet connection terminal is a settop box or a home server for DLNA, a video signal including, for example, data in a Red, Blue, and Green (RGB) format is outputted to an external display device, without using the display unit 206.

The network communication unit 207 includes, for example, a communication module capable of connecting to the internet. According to a request from the system control unit 202, the network communication unit 207 communicates predetermined data with the internet 104.

The internet browser 208 is software which operates according to an indication from the system control unit 202 and which conducts display control and management for contents received via the network communication unit 207 from the internet 104. The system control unit 202 reads the browser 208 from the data saving unit 209 to store it in a memory and controls the browser 208. The browser 208 may be implemented using a dedicated circuit.

A URL to be displayed on the internet browser 208 is received via the data transmitting and receiving unit 210 or the network communication unit 207, which will be described later, or is inputted by the user from a remote control device, not shown.

The data saving unit 209 includes an information recording device, e.g., a flash memory, an optical disk, a magnetic disk or the like to store program information of received digital broadcast programs, contents obtained from the internet 104, and data necessary for operations in respective processing units.

The data transmitting and receiving unit 210 includes a communication device which conducts radio communication with an external terminal such as the mobile terminal 101 according to standards of, for example, Bluetooth or the wireless Local Area Network (LAN). The unit 210 outputs data and signals received through the communication, to the system control unit 202.

As FIG. 3 shows, the mobile terminal 101 includes a communication unit 300, a system control unit 301, an internet browser 302, a data saving unit 303, a video processing unit 304, a display unit 305, and a data transmitting and receiving unit 306.

The communication unit 300 includes a function to conduct radio communication with the base station 103 and communicates necessary data according to a request from the system control unit 3. The unit 300 includes, for example, a transmitting and receiving device such as a front-end module.

The system control unit 301 includes an information processing device, for example, an MPU or a microprocessor and controls processing units required to access the internet and processing units required to conduct operations for another mobile terminal 101.

The internet browser 302 is software which conducts management and display control for contents received from the internet 104 via the communication unit 300 and the base station 103, according to an instruction from the system control unit 301. The system control unit 301 reads the browser 301 from the data saving unit 303 to store it in a memory and controls the browser 301. The browser 302 may be implemented using a dedicated circuit. It is assumed in the configuration that a URL of an internet site is obtained from the input unit 102 or is received via the communication unit 300 or the data transmitting and receiving unit 306, which will be described later.

The data saving unit 303 includes a flash memory and stores contents obtained from the internet 104 and data necessary for operations in respective processing units.

The video processing unit 304 includes a processing device such as an MPU. The unit 304 converts a content supplied from the internet browser 302 into data to be processed by the display unit 305 and delivers the data thereto.

The display unit 305 includes, for example, a display panel, a panel control circuit, and a panel control driver and displays an image on the display panel using data supplied from the video processing unit 304.

The data transmitting and receiving unit 306 conducts radio communication with an external terminal such as the internet connection terminal 100 according to standards of, for example, Bluetooth (registered trademark) or the wireless LAN. The unit 210 outputs data and signals received through the communication, to the system control unit 301.

In operation of the internet connection terminal 100 and the mobile terminal 101, an internet site being displayed on the mobile terminal 101 can be displayed on the internet connection terminal 100. Also, the user can operate the internet connection terminal 100 by use of the mobile terminal 101. FIG. 4 shows an outline of screen layouts and screen transitions on the terminals 100 and 101 in the configuration including state A, a screen display 401, a button display 402, a screen display 403, state B, a screen display 404, a button display 405, and a screen display 406.

State A shows states of screens on both terminals 100 and 101 when the user is conducting an internet browsing operation using the mobile terminal 101. The screen display 401 is an example when an internet site is displayed on the display unit 305 of the mobile terminal 101. The button display 402 is an icon displayed in the display unit 305 of the mobile terminal 101 and displays a relationship between the button display 402 and an operation conducted in response to depression of an associated button. This also applies to the button display 405. In the example, when the user presses a selection button of the button display 402 using the input unit 102, the system executes change-over processing to pass the display of the internet site to the internet connection terminal 100. The button is ordinarily assigned with another function of the cellular phone. The button may be configured such that the function is assigned in the change-over processing when the internet site is being displayed on the mobile terminal 101. The screen display 403 is an example in which a TV program is displayed on the display unit 206 of the internet connection terminal 100.

State B shows states of screens on both terminals 100 and 101 when the user is conducting an internet browsing operation using the internet connection terminal 100. The screen display 404 is an example when an operation guide is displayed on the display unit 305 of the mobile terminal 101 to operate the internet connection terminal 100 from the mobile terminal 101. In a state wherein the screen display 404 is being displayed on the display unit 305, the mobile terminal 101 can conduct operation for the internet connection terminal 100. The screen display 406 is an example in which an internet site is displayed on the display unit 206 of the internet connection terminal 100. Also, the screen display 406 shows a state in which a homepage of the internet site displayed on the mobile terminal 101 in the screen state 401 is displayed on the internet connection terminal 100. In the example, when the user presses a selection button of the button display 405 using the input unit 102, the system executes change-over processing to change the display of the internet site from the internet connection terminal 100 to the portable terminal 101.

In this situation, if the display operation changes from state A to state B, the internet site display on the mobile terminal 101 is terminated. if the display operation changes from state B to state A, the internet site display on the internet connection 100 is terminated.

In place of the button displays 402 and 405 and the buttons associated therewith, there may be arranged an input device of touch panel type.

Next, description will be given of operations in the internet connection terminal 100 and the mobile terminal 101 configured as above by referring to FIGS. 2 to 4 and the flowchart of FIG. 5.

During reception or playback of a digital broadcast, if the internet connection 100 receives a URL of an internet site sent by radio from the mobile terminal 101 as a result of an operation by the user, the internet connection terminal 100 displays an internet site indicated by the URL. Thereafter, the internet connection terminal 100 accepts an operation for the terminal 100 from the mobile terminal 101.

First, referring to FIG. 2, description will be given of an operation in which the internet connection terminal 100 conducts reception and playback of a digital broadcast.

Assume that the user carries out an operation to send an indication to the internet connection terminal 100, the indication requesting start of reception and playback of a digital broadcast, by using, for example, a remote control device, not shown.

In response to the indication, the terminal 100 converts the signal received by the data transmitting and receiving unit 210 from the remote control device into predetermined information and notifies the information to the system control unit 202. The control unit 202 delivers an indication to start reception processing to the digital broadcast receiving unit 200, digital broadcast signal processing unit 201, the audio processing unit 203, and the video processing unit 205.

In response to the indication from the system control unit 202, the digital broadcast receiving unit 200 decodes signals obtained from the antenna and the cable to produce data to be digitally processed by the digital broadcast processing unit 201 and outputs the data thereto.

The processing unit 201 separates video data and audio data from the received data and converts the video data and the audio data respectively into a predetermined video signal and a predetermined audio signal. In this situation, to output the video and audio signals with a correspondence established therebetween, these signals are outputted at synchronized timing.

The audio processing unit 203 converts the audio signal from the processing unit 201 into a signal suitable for an input to the speaker 204 and outputs the signal thereto. As a result, the speaker 204 produces sounds.

On the other hand, the video processing unit 205 converts the video signal from the processing unit 201 into a signal suitable for an input to the display unit 206 and outputs the signal thereto. As a result, the display unit 206 displays an associated image.

Through the sequence of operations, the internet connection terminal 100 conducts the reception and playback of the digital broadcast.

Referring now to FIG. 2, description will be given of an operation in which the terminal 100 accesses the internet 104 to display an internet site.

Assume that the user sends a URL of an internet site by radio from the input unit 102 or the like of the mobile terminal 101 to the internet connection terminal 100, which will be described later. The terminal 100 receives data through the radio communication by the data transmitting and receiving unit 210 and notifies the URL obtained from the data to the system control unit 202.

The system control unit 202 outputs the URL to the internet browser 208. The browser 208 having received the URL accesses via the system control unit 202 and the network communication unit 207 an internet site indicated by the URL to thereby receive data of the homepage of the internet site.

The network communication unit 207 accesses the internet 104 using a communication protocol of, for example, HyperText Transfer Protocol (HTTP) to receive the homepage data of the internet site and outputs the data via the system control unit 202 to the internet browser 208. The browser 208 constructs an image to be displayed as a homepage using the data, converts the image into a video signal to be inputted to the video processing unit 205, and outputs the signal thereto.

The video processing unit 205 converts the video signal from the browser 208 into a signal suitable for an input to the display unit 206 and outputs the signal thereto. The display unit 206 resultantly displays the homepage image. During the operation, if there exists data to be temporarily stored in the terminal, the internet browser 208 saves the data in the data saving unit 209 according to necessity.

If the user conducts a predetermined operation when the internet site is being displayed as above, the mobile terminal 101 transmits by radio the URL of the internet site to the internet connection terminal 100 and then enters a state capable of operating the internet connection terminal 100. This enables the user to operate the internet connection terminal 100 from the mobile terminal 101.

Referring now to FIG. 3, description will be given of an operation in which the mobile terminal 101 accesses the internet 104 via the base station 103 to display an internet site.

Assume that the user conducts a predetermined operation for the mobile terminal 101 via the input unit 102 of the mobile terminal 101 to indicate display of the internet site existing in the mobile terminal 101.

In response to the indication from the user received via the input unit 102, the system control unit 301 of the mobile terminal 101 activates the internet browser 302 to display the internet site. The control unit 301 accesses the internet site which the browser 302 displays via the communication unit 300 immediately after the activation, and issues an indication to the communication unit 300 to receive data of the homepage of the internet site.

The communication unit 300 conducts radio communication with the base station 103 to access the internet 104 via the base station 103 and receives the homepage data of the internet site. Also, the communication unit 300 outputs the data to the internet browser 302. When the data is received, the browser 302 constructs an image to be displayed as a homepage using the data and converts the image into a video signal to be inputted to the video processing unit 304 to output the signal thereto. The processing unit 304 converts the video signal from the browser 302 into a signal to be inputted to the display unit 305 to output the signal thereto. As a result, the display unit 305 displays an image of the homepage. During the operation, if there exists data to be temporarily stored in the terminal, the internet browser 302 saves the data in the data saving unit 303 according to necessity.

Similarly, the mobile terminal 101 obtains a URL as an input from the user or a URL included in the hyper link and controls operation to access an internet site indicated by the URL. The system control unit 301 controls operation to store the URL of the internet site displayed by the browser 302 in the data saving unit 303.

Next, description will be given in detail of an operation using the internet connection terminal 100 and the mobile terminal 101. Specifically, an internet site to be displayed on the mobile terminal 101 is displayed on the internet connection terminal 100. After the display of the internet site, the internet connection terminal 100 is operated from the mobile terminal 101. The operation is explained using FIGS. 4 and 5.

In FIG. 5, operations respectively of the mobile terminal 101 and the internet connection terminal 100 are shown in frames 500 and 513, respectively. In association with explanation of respective operation flows in the frames 500 and 513, description will be given of the operation flows in the terminals 101 and 100 and a relationship therebetween. Assume in the description that a cellular phone is employed as an example of the mobile terminal 101 and a television set including an internet connecting function is used as an example of the internet connection terminal 100.

First, by using, for example, the input unit 102, the user beforehand sets a type of the television set for the internet browsing to the cellular phone, which will be described later, by designating a maker and a model number using a predetermined setting screen (step 501). The number such as the model number, the operation, and a signal and information to be transmitted are stored in the data saving unit 303 with a correspondence established therebetween. The control unit 301 establishes a correspondence between the operation stored in the data saving unit 303 and the information to be transmitted. This resultantly sets a command to transmit the information to the TV set. After the setup of the command, the system enters a state in which the cellular phone is capable of transmitting a command recognizable by the TV set thereto.

The user powers the TV set by conducting an ordinary operation, and the TV set receives and reproduces a broadcast received from the digital broadcast receiving unit 200 as described above (step 514). In step 514, the user operates the TV set as a single device. This state is referred to as an ordinary mode of the TV set. The state in which the TV has been powered indicates a state in which at least a main power source thereof is on.

The user conducts a predetermined operation to start displaying an internet site on the cellular phone. As a result, an internet site is displayed on the screen display 401 so that the user browse the internet site (step 502).

In steps 501 and 502, the user operates the cellular phone as a single device. This state is referred to as an ordinary mode of the cellular phone.

Assume that the user attempts, during the internet site browsing, to browse the internet site by use of the TV set. In this situation, the user operates the input unit 102 to select the button 402 in the display unit 305 of the cellular phone (step 503). Then, the cellular hone enters a display change mode to execute processing to change the display of the internet site to the TV set.

When the cellular phone enters the display change mode, the system control unit 301 of the cellular phone sends the URL of the internet site on the display via the data transmitting and receiving unit 306 to the TV set (step 504). After the URL transmission or in concurrence with therewith, the system control unit 301 controls the display unit 305 and the like to terminate the display of the internet site on the cellular phone. Also, the cellular phone may be configured such that the cellular phone transmits together with the URL a signal indicating the internet site display to the TV set.

The TV set receives the URL via the data transmitting and receiving unit 210 from the cellular phone (step 515), connects to the internet site indicated by the URL in the procedure described above, and displays the internet site on the display unit 206 as indicated by the screen display 406 (step 516). As a result of step 516, the TV set enters a state to receive operation from the cellular phone. This mode is referred to as an external operation receive mode. Through the operation of step 516, the display on the TV set changes from the old content to a content corresponding to the URL from the cellular phone.

On the other hand, the cellular phone enters, after the transmission of the URL, a state in which the system control unit 301 is capable of operating the TV set using part of the input unit 102, which will be described later. This mode is referred to as an operation change mode. The display unit 305 presents a display to inform the user of operations which can be conducted by pressing keys as shown, for example, in the screen display 404 (step 505).

In this state in which the TV set can be operated if the user presses a desired key of the input unit 102, data which indicates an operation for the TV set and which can be interpreted by the TV set designated in step 501 is sent to the TV set. The data includes data items almost the same as those of data sent from a remote control device of the TV set. Therefore, in a situation wherein it is desired to move a selection item of an internet site being displayed on the TV set or to determine a selection item, if the user operates the input unit 102 of the cellular phone to press a key corresponding to an operation information item shown in the screen display 404, the cellular phone sends an information item and a signal indicating an indication of the operation to the TV set (step 506). As a result of this step, the cellular phone serves as a remote control device of the TV set. The operation of this step is carried out, for example, under supervision of the system control unit 301.

When the data transmitting and receiving unit 210 receives the information and the signal of the operation indication such as “move” or “select” from the cellular phone, the TV set reflects, under control of the system control unit 201, the information of the indication in the screen display 406 displaying the internet and in the operation of the browser 208 (step 517).

If the user desires to return from the state in which the user browses the internet site on the TV set to a state in which the user browses the internet site on the cellular phone, the user conducts an operation to select an item of the button display 405 in the display unit 305 of the cellular phone (step 507). Then, the cellular phone sends data indicating termination of the internet display via the data transmitting and receiving unit 306 to the TV set (step 508). After or in concurrent with the URL transmission, the internet control unit 202 controls, for example, the display unit 206 to terminate the internet site display on the TV set.

When the data transmitting and receiving unit 210 receives the data, the TV set interrupts the internet site display (step 518). Also, the TV set sends the URL of the internet site last displayed on the TV set via the data transmitting and receiving unit 210 to the cellular phone (step 519) and then displays a TV program being displayed before the start of the internet display, for example, as shown in the screen display 403 (step 520). In step 520, the TV set again enters the state to operate as a single unit, i.e., in the ordinary mode. Moreover, in step 520, the TV set resumes displaying the content being displayed before the reception of the URL from the cellular phone. It is also possible in step 520 that the TV set only terminates the display of the internet site. This mitigates the operation load imposed on the user to terminate the display on the TV set.

The cellular phone receives the URL of the internet site last displayed on the TV set and then accesses and displays the internet site of the URL (step 510). Resultantly, the internet site display is changed from the TV set to the cellular phone, and hence the cellular phone enters the display change mode. The operation of the step is carried out, for example, under supervision of the control unit 301. Through the operation of this step, the cellular phone resumes the internet site display.

In this situation, the system control unit 301 changes the function to assign part of the keys of the input unit 102 to operate the TV set from the cellular phone and treats the keys as those to ordinarily operate the cellular phone (step 511). The screen display is changed, for example, from the screen display 404 to the screen display 401, and the user continues browsing the internet site display as shown in the screen display 401 (step 512). In step 512, the cellular phone returns to the state to operate as a single unit, i.e., in the ordinary mode.

As above, the URL of the internet site to be browsed on the mobile terminal 101 is sent by radio to the internet connection terminal 100. The terminal 100 having received the URL displays the internet site. From the mobile terminal 101, the user operates the internet connection terminal 100 displaying the internet site.

When the user presses only once the button to change the internet display to the internet connection terminal 100, the mobile terminal 101 changes from the ordinary mode for the operation as a single unit to the display change mode to change the display to the internet connection terminal 100. Subsequently, the mode is sequentially changed to the operation change mode to operate the internet connection terminal 100 from the mobile terminal 101. Also, to display the internet again on the mobile terminal 101, if the user presses only once the button to view the internet on the mobile terminal 101, the mobile terminal 101 conducts a sequence of transition steps. Specifically, the mobile terminal 101 terminates the operation change mode and enters to the display change mode, and then returns to the ordinary mode.

Without conducting any operation for the terminal which desires to display an internet site as above, the user can display the internet site on a large screen through a simple operation using only the mobile terminal 100. Also, the user can continuously employ the mobile terminal 100 to operate the terminal which has displayed the internet site. The user is capable of smoothly conducting a change-over of the display of the internet site between different terminals.

In the screen display 406 of the embodiment, the internet site is displayed on the display unit 206 of the internet connection terminal 101 in the full screen display mode. However, the internet site may be displayed in a partial area of the screen.

In the embodiment, while an internet site is being browsed on the mobile terminal 101, an entity which conducts the communication via the internet and the processing to receive information to produce a video therefrom is changed from the mobile terminal 101 to the internet communication device or terminal 100. Therefore, for example, if the communication speed of the internet communication device 100 to conduct communication via the internet is higher than that of the mobile terminal 101 to conduct communication via the internet, the user can conduct the operation to carry out the internet browsing from the mobile terminal 101 and also can of conducting the operation through the higher-speed communication.

In the description of the embodiment, a TV set, a set box device, and a server for DLNA may be employed as the internet communication device 100. In this connection, by using these devices, it is possible to solve problems occurring in some situations as follows.

For example, these information processing devices such as a TV set are installed in a living room or the like to be commonly used by a plurality of persons in many cases. There likely occurs a situation wherein the viewing of the display of the TV set is required to be abruptly interrupted, leading to a problem. Specifically, since a plurality of persons are viewing the TV set, it is difficult for a person to display an internet site on the TV.

For the user to continue the viewing of the internet site on the mobile terminal 100, there will be considered a case in which, for example, the user interrupts the viewing of the internet site display screen on the TV set to activate the browser of the cellular phone with a communication function and then inputs a URL of the internet site to the cellular phone to thereby continue the viewing on the cellular phone. This however leads to a problem of increase in the number of operation steps.

In consideration of this situation, the problem can be solved by using the mobile terminal 101 and the internet connection device 100 according to the embodiment. Additionally, there is obtained usability and operability for the user to easily carry out the operation to change the entity of the display and the communication from the mobile terminal 101 to the internet connection device 100 and vice versa.

Although description has been given of the internet as an example of content information in conjunction with the embodiment, the embodiment is not restricted by this example. That is, information indicating such content as a TV program is also available. Also, a URL has been described as an example of the identification information. However, the embodiment is not limited to the URL. For example, information indicating a channel of a TV program may also be used as the identification information.

Second Embodiment

Description will now be given of a second embodiment. Specifically, description will be given of a method of implementing an operation equivalent to that of the first embodiment, by use of an infrared-ray communication to communicate an URL and indications of various operations between the internet communication terminal 100 and the mobile terminal 101.

The second embodiment will be described by referring to the drawings. In the description, almost the same constituent components as those of the first embodiment are assigned with the same reference numerals, and description thereof will be avoided.

The internet communication terminal 100 of the second embodiment shown in FIG. 6 differs from that of the first embodiment shown in FIG. 2 in that the data transmitting and receiving unit 210 is replaced by an infrared-ray transmitting and receiving unit 600. The unit 600 communicates data according to a communication format prescribed by, for example, a maker and using an infrared-ray communication conforming to the IrDA (Infrared Data Association) standard.

The mobile terminal 101 of the second embodiment shown in FIG. 7 differs from that of the first embodiment shown in FIG. 2 in that the data transmitting and receiving unit 306 is replaced by an infrared-ray transmitting and receiving unit 700. The unit 700 communicates data using an infrared-ray signal conforming to, for example, the IrDA standard.

Referring now to FIGS. 6 and 7 and the flowchart of FIGS. 8A and 8B, description will be given of operation of the second embodiment. According to this embodiment, in the reception and reproduction of a digital broadcast, when the internet connection terminal 100 receives an URL of an internet site sent through an infrared-ray communication from the mobile terminal 101 as a result of an operation by the user, the internet connection terminal 100 displays the internet site and then receives an operation of the terminal 100 from the mobile terminal 101 through the infrared-ray communication.

FIGS. 8A and 8B are added with the steps in bold-line frames to the flowchart of FIG. 5 of the first embodiment. In FIGS. 8A and 8B, like in FIG. 5, operations respectively of the mobile terminal 101 and the internet connection terminal 100 are shown in the frames 500 and 513, respectively. In association with explanation of respective operation flows in the frames 500 and 513, description will be given of the operation flows in the terminals 101 and 100 and a relationship therebetween. Assume in the description that a cellular phone is employed as an example of the mobile terminal 101 and a television set including an internet connecting function is used as an example of the internet connection terminal 100.

First, by using, for example, the input unit 102, the user beforehand sets to the cellular phone a type of the television set for the internet browsing, which will be described later, by designating a maker and a model number using a predetermined setting screen (step 501). In this embodiment, the command is, for example, a general infrared-ray command to be received and processed by a TV set. The general infrared-ray command is a command which is transmitted in a format of, for example, a Pulse Position Modulation (PPM). The format of the command is determined, for example, for each maker and is a format employed for the communication with an associated remote control device.

The user powers the TV set by conducting an ordinary operation. The TV set receives a broadcast via the digital broadcast receiving unit 200 and reproduces the broadcast as described above (step 514).

The user conducts an operation to start a predetermined internet display on the cellular phone. As a result, an internet site is displayed on the screen display 401 so that the user browses the internet site (step 502).

Assume that the user attempts, during the internet site browsing, to browse the internet site by use of the TV set. In this situation, the user operates the input unit 102 of the cellular phone to select the button 402 in the display unit 305 (step 503).

In response to the operation, the infrared-ray transmitting and receiving unit 700 of the cellular phone transmits an infrared-ray command recognizable by a TV set of the type designated in step 501 to thereby start IrDA communication (step 800). The TV set having received the command starts the IrDA communication (step 801) to request the cellular phone to connect to the IrDA communication (step 802). The cellular phone prepares, immediately after the command transmission in step 800, to start connecting to the IrDA communication and responds to the IrDA communication connection from the TV set. The IrDA communication connection is established between the TV set and the cellular phone (step 803). After the URL transmission or in concurrence therewith, the system control unit 301 controls the display unit 305 and associated constituent elements to terminate the internet site display on the cellular phone.

After the IrDA communication connection is established, the system control unit 301 of the cellular phone sends by the infrared-ray transmitting and receiving unit 700 the URL of the internet site being on the display through the IrDA communication to the TV set (step 504).

The TV set receives the URL via the infrared-ray transmitting and receiving unit 600 from the cellular phone (step 515). Also, the TV set sends by the infrared-ray transmitting and receiving unit 700 data indicating successful reception of the URL via the IrDA communication to the cellular phone (step 804). When the data is received (step 805), the cellular phone disconnects the IrDA communication conducted by the unit 700 (step 806). As a result of the disconnection, the TV set also terminates the IrDA communication of the data transmitting and receiving unit 600 to enter a state to receive an ordinary infrared-ray command also used by a remote control device, not shown. The TV set then connects to the internet site indicated by the URL in the procedure described above, and displays the internet site on the display unit 206 as indicated by the screen display 406 (step 516).

On the other hand, after the transmission of the URL, the cellular phone enters a state in which the system control unit 301 is capable of operating the TV set, which will be described later, by using part of the input unit 102. The display unit 305 presents a display to inform the user of operations which can be conducted by pressing keys as shown, for example, in the screen display 404 (step 505). In this state in which the TV set can be operated, if the user presses an associated key of the input unit 102, an infrared-ray command which indicates an operation for the TV set and which can be interpreted by the TV set designated in step 501 is sent via the infrared-ray transmitting and receiving unit 700 to the TV set. The infrared-ray command includes information almost the same as that of an infrared-ray command sent from a remote control device of the TV set. Therefore, in a situation wherein it is desired to move a selection item of an internet site being displayed on the TV set or to determine a selection item, if the user operates the input unit 102 of the cellular phone to press a key corresponding to an operation information item shown in the screen display 404, the cellular phone sends an indication of the operation to the TV set (step 506).

When the operation indication is received from the cellular phone, the TV set reflects the information of the indication in the screen display 406 displaying the internet and in the operation of the browser 208 (step 517).

In the state in which the user browses the internet site on the TV set, if it is desired to return to a state in which the user browses the internet site on the cellular phone, the user conducts an operation to select an associated item of the button display 405 in the display unit 305 of the cellular phone (step 507). Then, the cellular phone sends an infrared-ray command indicating termination of the internet display via the infrared-ray transmitting and receiving unit 700 to the TV set (step 508).

When the infrared-ray command is received, the TV set interrupts the internet site display (step 518). The TV set starts the IrDA communication to request the cellular phone to connect to the IrDA communication (step 808). On the other hand, immediately after the transmission of the infrared-ray command, the cellular phone starts the IrDA communication to receive the request for the connection to the IrDA communication from the TV set, and the IrDA communication is resultantly established (step 809).

After the communication connection is established, the TV set sends the URL of the internet site last displayed on the TV set via the infrared-ray transmitting and receiving unit 600 to the cellular phone (step 519). The cellular phone receives the URL (step 509) and sends data indicating successful reception of the URL through the IrDA communication to the TV set (step 810). The TV set receives the data (step 811), terminates the IrDA communication of the unit 600, and enters a state to receive an ordinary infrared-ray command like that to be received from a remote control device, not shown (step 812). Also, the TV displays a TV program being displayed before the start of the internet display, for example, as shown in the screen display 403 (step 520).

On the other hand, after receiving the URL of the internet site last displayed on the TV set, the cellular phone terminates the IrDA communication (step 813) and then accesses and displays the internet site of the URL (step 510). In this situation, the system control unit 301 changes the function to assign part of the keys of the input unit 102 to operate the TV set from the cellular phone and treats the keys as those to ordinarily operate the cellular phone (step 511). The screen display is changed, for example, from the screen display 404 to the screen display 401, and the user continues browsing the internet site display as shown in the screen display 401 (step 512).

As above, the URL of the internet site to be browsed on the mobile terminal 101 is sent through the infrared-ray communication to the internet connection terminal 100. The terminal 100 having received the URL displays thereon the internet site. From the mobile terminal 101, the user operates the internet connection terminal 100 displaying the internet site. In Association with the transmission of the URL and the operation indication, the operation in which the TV set is operated from the cellular phone is implemented, by conducting a change-over between the communication using an infrared-ray command received by the TV from a remote control device and the communication of IrDA.

Therefore, without conducting any operation for the terminal which desires to display an internet site as above, the user can display the internet site on a larger screen through a simple operation using only the mobile terminal 100. Also, the user can continuously use the mobile terminal 100 to operate the terminal which has displayed the internet site. The user is capable of smoothly conducting a change-over of the internet site display between different terminals.

Although the IrDA communication is employed to transmit the URL in the configuration of the embodiment, there may be employed any appropriate communication other than the IrDA communication.

In the description of the embodiment, a TV set, a set box device, and a server for DLNA may be employed as the internet communication device 100. In this connection, by using these devices, it is possible to solve problems occurring in some situations as follows.

For example, for the general infrared-ray command used in a TV set, the types of such commands to be communicated are limited or the communication speed is limited. On the other hand, the signal indicating information of operation is larger in the amount of information than the signal which is communicated by a remote control device only to turn on or off the power source. Hence, when the general infrared-ray command used, there occurs a problem in which the URL and the information of operation cannot be communicated between the portable terminal and the information processing apparatus or a problem in which the communication of information, even if possible, takes a long period of time.

On the other hand, in the communication conforming to IrDA, it is required to establish communication between the mobile terminal 101 and the internet connection terminal 100 to communicate information therebetween. Therefore, if a change-over from the communication of the general command to the IrDA communication is not conducted, it is required in any situation that the information processing apparatus enters the state to wait for the IrDA communication. Moreover, if the state to establish the connection is kept set as above, there occurs a drawback in which the internet connection terminal 100 cannot conduct the infrared-ray communication with other devices.

According to the embodiment, since the communication is changed using as a trigger a command, i.e., a general infrared-ray command, the drawback is removed, and it is possible to improve operability and usability.

Although the IrDA communication has been described as an example in the embodiment, it is also possible to use, for example, a communication by Bluetooth, a wireless communication such as a wireless LAN, and a short-distance communication such as a communication by sound waves. The embodiment is particularly useful in a communication using a communication scheme in which a communication link is established to communicate information.

Although description has been given of the internet as an example of the content information in conjunction with the embodiment, the embodiment is not restricted by this example. That is, information indicating such content as a TV program is also available. Moreover, a URL has been described as an example of the identification information. However, the embodiment is not limited by this example. For example, information indicating a channel of a TV program may also be used as the identification information.

Third Embodiment

Description will now be given of a third embodiment, specifically, a method of implementing an operation in the communication of an URL and indications of various operations between the internet communication terminal 100 and the mobile terminal 101 of the first embodiment. According to the embodiment, there are conducted not only an operation to display internet indicated by the URL, but also an operation in which the state of the mobile terminal 101 displaying the internet site is also passed from the mobile terminal 101 to the internet communication terminal 100.

The state of the mobile terminal 101 displaying the internet site indicates, for example, a state wherein the mobile terminal 101 is displaying a screen after the login of an internet site for which authentication is required. Furthermore, the state wherein the mobile terminal 101 is displaying a screen indicates a display state after a display state change of an internet site in which a content display state dynamically changes with an associated URL kept unchanged.

The information representing the display state includes, for example, information indicating a history of user operations which have influenced upon the display on the display unit 305. The information representing the display state may also include information which is not included in the URL and which influences upon the display on the display unit 305 in the internet site browsing. Also, the display state representing information may be information indicating a character encoding item designating, for example, Shift-JIS, enhanced Unix Code (EUC), or Unicode Transformation Format (UTF)-8. In addition, the information may also be Cookie. Furthermore, in a situation wherein the mobile terminal 101 is displaying an internet site, the information may be information indicating, for example, the position of a scroll bar. As for the position of a pointer or the like, the information may be information indicating a relative position thereof on the display screen. As a result, even if the display area size varies between the mobile terminal 101 and the internet connection terminal 100, the relative position can be reproduced on the internet connection terminal 100.

The third embodiment will be described by referring to the drawings wherein an internet site requiring authentication is passed from the mobile terminal 101 to the internet connection terminal 100. In the description, almost the same constituent components as those of the preceding embodiments are assigned with the same reference numerals, and description thereof will be avoided.

FIG. 9 shows an example of items and information thereof in a user operation history 900 used in an operation in which the user browses an internet site requiring authentication. Specifically, the mobile terminal 101 records the items of the operation history for each user operation for the internet site and then saves the operation history 900 in the data saving unit 303.

The information in the operation history 900 includes, for example, a character string inputted to a text box, information items indicating a button and an icon used on the internet site, and information indicating an item selected in a list box. The information in the operation history 900 may also include information indicating a URL displayed as a result of the operation.

FIG. 10 shows an example of items and information thereof in a user operation history 1000 used in an operation wherein the user browses an internet content in which the internet content dynamically changes with the URL kept unchanged. The mobile terminal 101 records the items of the operation history 1000 for each user operation for the internet content and then saves the operation history 1000 in the data saving unit 303. The operation history 1000 includes, for example, information indicating a position of coordinates clicked by the user.

FIG. 11 shows transmitted data sent from the mobile terminal 101 to the internet connection terminal 100. The data 1100 includes header data 1101 including a data length and information to identify a data type, an internet site URL 1102, and an operation history 900.

Next, operation of the third embodiment will be described by referring to FIGS. 9 to 11 and the flowchart of FIG. 12. In the embodiment, if the internet site to be browsed by the user is, for example, an internet site requiring authentication or an internet content in which the internet content dynamically changes with the URL kept unchanged, the mobile terminal 101 records an operation history 900 of user operations for the internet site. In the transmission of a URL of an internet site to the internet connection terminal 100 in a manner similar to that of the first embodiment, the mobile terminal 101 sends transmission data 1100 including the operation history in addition to the URL thereto. If the data 1100 is received, the terminal 100 accesses the internet site of the URL, conducts an operation substantially equal to the user operation indicated by the operation history 900 for the resultantly displayed internet site, and displays the internet site for which the operation has been carried out.

FIG. 12 is a flowchart implemented by adding steps shown in bold-line frames to the flowchart of FIG. 1 used in the first embodiment. FIG. 12 shows operations respectively of the mobile terminal 101 and the internet connection terminal 100 respectively in frames 500 and 513 as in FIG. 5. Description will be given of the operations of the frames 500 and 513 in a concurrent fashion. That is, the operation flows of the terminals 101 and 100 and a relationship between the operation flows will be described at the same time. Assume in the description that a cellular phone is employed as an example of the mobile terminal 101 and a television set including an internet connecting function is used as an example of the internet connection terminal 100.

According to the embodiment, in a situation wherein the user is browsing an internet site in step 502, each time the user conducts an operation, e.g., selection or input of a data item for the internet site, the cellular phone records the operation histories 900 and 1000 in the data saving unit 209 (step 1201).

However, it is not necessary required that the cellular phone records the operation histories 900 and 1000 of all internet sites browsed by the user. That is, the cellular phone may record the histories only for each internet site for which, for example, the URL starts with Hypertext Transfer Protocol Security (HTTPS), i.e., for which security is essential, each internet site dynamically created by a function such as Active Server Pages (ASP), or each internet site of which document layout information of the displayed internet site includes an interactive content such as FLASH (registered trademark). If the internet site includes a content of FLASH or ASP, the site is defined using a tag in a source file. Hence, the cellular phone can determine the type of the internet site using the tag.

Also, if the internet site is an internet site dynamically created, it is not required to store all operation histories in the operation history 1100. The operation history may be configured to record a history associated with operations which have changed the display. For example, if the internet site includes a dynamic FLASH content, the operation history may be configured to record operations such as a clicking operation and an input operation of a character string for the dynamic content.

In step 503, to view the internet site on the TV set, when the user conducts an operation to select a button corresponding to the button display 402 presented on the display unit 305 of the cellular phone, the cellular phone creates transmission data 1100 including a URL 1102 of the internet site as an initial point of the recording for the operation history 900 or 1000, the operation history 900 or 1000, and header data 1101, and then sends the transmission data 1100 to the TV set. After the URL transmission, the system control unit 301 controls the display unit 305 to terminate the display of the internet site on the cellular phone.

On the other hand, at reception of the transmission data 1100 (step 1203), the TV set accesses the internet of the URL 1102, conducts the operation indicated by the operation history 900 or 1000 for the internet site, and displays the internet site for which the operation has been conducted (step 1204).

In steps 509 and 519 in which the TV set sends a URL to the cellular phone to return control to the cellular phone to access and to display the internet site, a method similar to that described above is also employed.

If the internet site which the user browses on the cellular phone is an internet site requiring authentication or an internet content in which the internet content dynamically changes with the URL kept unchanged, the TV set records the operation histories 900 and 1000 of user operations for the internet site in the data saving unit 209. Also, the TV set sends transmission data 1100 including a URL of the internet site as an initial point of the recording for the operation histories 900 and 1000 and the operation histories 900 or 1000 to the cellular phone. The cellular phone having received the data 1100 accesses the internet site of the URL and conducts an operation indicated by the operation histories 900 and 1000, producing an internet site in the state after the operation. The TV set also displays the internet site thus produced.

Therefore, to conduct a change-over operation of the access to one and the same internet site between different terminals, it is possible for the user, also in a situation wherein the internet site being browsed is an internet site requiring authentication or is a dynamically changing internet content with the URL kept unchanged, to smoothly achieve the change-over operation without again conducting the authentication and the content operation for the terminal which accesses the internet site after the change-over.

In a situation wherein a cellular phone sends a URL without any display information to an information processing apparatus such as a TV set, an internet site of the URL is displayed on the information processing apparatus in a state in which no operation influencing the display has been conducted. Hence, if the configuration of the internet site becomes more complex, a larger number of operation steps are required from the transmission of the URL to the setup of the state in which the operation on the cellular phone is reflected in the information processing apparatus. However, according to the mobile terminal 101 and the internet connection terminal 100 of the embodiment, it is possible to reduce the operation steps.

Description has been given of the first to third embodiments. The smooth access change-over associated with the internet communication between a plurality of terminals is achievable even if the mobile terminal 101 is replaced with any other information processing terminal.

According to the portable terminal of the embodiments, there are provided a portable terminal, an information processing apparatus, a content display system, and a content display method in which the viewing of a content on the portable terminal is smoothly passed to an information processing apparatus.

It should be further understood by those skilled in the art that although the foregoing description has been made on embodiments of the invention, the invention is not limited thereto and various changes and modifications may be made without departing from the spirit of the invention and the scope of the appended claims. 

1. A portable terminal, comprising: a receiving unit which receives content information; an external device communication unit which conducts communication with an external information device; a display unit which displays the content information received by the receiving unit; an acquiring unit which acquires identification information identifying the content information displayed by the display unit; an operation unit which receives an operation indication from a user; and a control unit which conducts control such that if a transmission indication of the identification information is received by the operation unit while the content information is being displayed, the identification information acquired by the acquiring unit is transmitted to the external information device and the display of the content information by the display unit is terminated.
 2. A portable terminal according to claim 1, wherein the control unit conducts control such that if the operation unit conducts an operation to indicate termination of the display of the content information by the external information device, a signal to indicate termination of the content information is transmitted to the external information device and the display of the content information by the display unit is resumed.
 3. A portable terminal according to claim 1, wherein: the indication of transmission of the identification information is conducted by an operation to press a predetermined button; the display unit displays a message indicating a change-over of an entity of the display of the content information in response to the operation to press a predetermined button; and the control unit conducts control such that if the operation to press a predetermined button is conducted after the transmission of the identification information, a signal to indicate termination of the display of the content information is transmitted to the external information device and the display of the content information by the display unit is resumed.
 4. A portable terminal according to claim 1, wherein the control unit conducts control such that if the operation unit conducts an operation to indicate termination of the display of the content information by the external information device, a signal indicating transmission of identification information identifying the content information being outputted to the external information device is transmitted to the external information device, the identification information is received from the external information device, content information corresponding to the identification information is received, and the content information is displayed by the display unit.
 5. A portable terminal according to claim 1, wherein the control unit conducts control such that after the transmission of the identification information to the external information device, the portable terminal is made to serve as a remote control device which operates the external information device.
 6. A portable terminal according to claim 5, wherein the control unit conducts control such that if the operation unit conducts an operation to indicate termination of the display of the content information by the external information device, the control to make the portable terminal serve as a remote control device is terminated.
 7. A portable terminal according to claim 1, wherein: the content information is content information of an internet site; the display unit displays an internet site of which content information is received by the receiving unit; and the identification information is Uniform Resource Locator (URL) information of the internet site, the portable terminal further comprising a display information acquiring unit which acquires display information indicating a state in which an internet site is being displayed on the display unit, and the control unit conducts control such that if a transmission indication of the identification information is received by the operation unit while the content information is being displayed, the URL information acquired by the display information acquiring unit and display information associated with the URL information are transmitted to the external information device.
 8. A portable terminal according to claim 7, wherein the display information is history information (900, 1000) indicating a history of operations conducted while the internet site is being displayed on the portable terminal.
 9. A portable terminal according to claim 7, wherein the display information is information indicating a position of a pointer displayed together with the internet site on the portable terminal.
 10. A portable terminal according to claim 1, wherein: the external device communication unit is an infrared-ray communication unit using an infrared ray; and the control unit transmits, when transmitting the identification information, a command indicating a start of communication from the infrared-ray communication unit to the external information device and starts infrared-ray communication conforming to an IrDA standard after the command is transmitted, thereby transmitting the identification information.
 11. An information processing apparatus, comprising: an input unit which inputs content information; a communication unit which conducts communication with a portable terminal; a display unit which displays the content information inputted by the input unit; and a control unit which conducts control such that if the communication unit receives identification information identifying second content information displayed on the portable terminal from the portable terminal while the display unit is displaying first content information, the input unit inputs the second content information corresponding to the identification information to be displayed on the display unit, and the display unit displays the second content information in place of the first content information, the control unit conducting control such that if the communication unit receives an indication signal indicating termination of the display of the second content information by the display unit, the display of the second content information is terminated and the display of the first content information is resumed.
 12. An information processing apparatus according to claim 11, wherein the control unit conducts control such that if the communication unit receives an indication signal indicating termination of the display of the second content information by the display unit, identification information identifying the second content information being displayed on the display unit when the indication signal is received is transmitted to the portable terminal.
 13. An information processing apparatus according to claim 11, wherein: the second content information is content information of an internet site; the display unit displays an internet site the content information of which is inputted by the input unit; the identification information is URL information of the internet site; and the control unit conducts control such that if the communication unit receives URL information corresponding to the internet site displayed on the portable terminal and display information indicating a state of the internet site displayed on the portable terminal, the internet site indicated by the URL information is displayed in the state indicated by the display information.
 14. An information processing apparatus according to claim 13, wherein the display information is history information indicating a history of operations conducted while the internet site is being displayed on the portable terminal.
 15. An information processing apparatus according to claim 13, wherein the display information is information indicating a position of a pointer displayed together with the internet site on the portable terminal.
 16. An information processing apparatus according to claim 11, wherein: the communication unit is an infrared-ray communication unit using an infrared ray; and the control unit conducts control such that if the infrared-ray communication unit receives a general command to conduct infrared-ray communication conforming to an IrDA standard, the infrared-ray communication is started to transmit or to receive the identification information through the infrared-ray communication.
 17. A content display system comprising a portable terminal and an information processing apparatus, wherein: the portable terminal comprises; a receiving unit which receives first content information, an external device communication unit which conducts communication with an external information device, a first display unit which displays the first content information received by the receiving unit, an acquiring unit which acquires identification information identifying the first content information displayed on first display unit, an operation unit which receives an operation indication from a user, and a portable terminal control unit which controls the portable terminal, the information processing apparatus comprises; an input unit which inputs second content information, a communication unit which conducts communication with a portable terminal, a second display unit which displays the second content information inputted from the input unit, and an information processing apparatus control unit which controls the information processing apparatus, and the portable terminal control unit conducts control such that if a transmission indication of the identification information is received by the operation unit while the first content information is being displayed, the identification information acquired by the acquiring unit is transmitted to the external information device and the display of the content information by the display unit is terminated, the portable terminal control unit conducting control such that if the communication unit receives identification information identifying the content information displayed on the portable terminal while the second content information is being displayed, the input unit inputs first content information corresponding to the identification information to be displayed on the display unit, and the display unit displays the second content information in place of the first content information.
 18. A portable terminal which conducts communication with an external information device capable of displaying content information, comprising: operation unit which receives an operation from a user; an external device communication unit which transmits, if the operation unit receives, while the external information device is displaying content information, an operation indicating termination of the display of the content information by the external information device, a signal indicating termination of the display of the content information by the external information device is transmitted to the external information device, and which then receives identification information identifying the content information being displayed on the external information device from the external device communication unit, a receiving unit which receives content information indicated by the identification information received by the external device communication unit; and a display unit which displays the content information received by the receiving unit.
 19. A content display method which relays a display of content information between a portable terminal and an information processing apparatus, comprising the steps of: receiving content information by the portable terminal; displaying the content information; acquiring identification information of the content information; terminating, at reception of a predetermined operation from a user, the display of the content information and transmitting the identification information to the information processing apparatus; receiving the identification information by the information processing apparatus; receiving content information corresponding to the identification information; and displaying the content information by the information processing apparatus. 